Speed control apparatus for AC elevator

Details Speed control apparatus for AC elevator Speed control apparatus for AC elevator

1977-03-16

1978-10-31

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318408, B66B 130

Patent

active

041229193

ABSTRACT:
A speed control apparatus for AC elevator comprises a multi-speed AC motor having two or more windings and a power running circuit for starting the motor by a low speed winding in the acceleration and switching to a high speed winding after accelerating it near the synchronous speed.

REFERENCES:
patent: 2393998 (1946-02-01), Mahnke
patent: 2974267 (1961-03-01), Holcombe
patent: 3687235 (1972-08-01), Mitsui et al.
patent: 3798519 (1974-03-01), Habisohn
patent: 4042069 (1977-08-01), Ohira et al.

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